Mitsubishi MXZ-2A52VA Service Manual

SERVICE MANUALCONTENTS1. TECHNICAL CHANGES ····································22. PART NAMES AND FUNCTIONS······················73. INDOOR/OUTDOOR CO

1022253522+2222+2522+3525+2525+35Indoor unitscombinationUnit AUnit BCooling capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%

1122253522+2222+2522+3525+2525+3535+35Indoor unitscombinationUnit AUnit BCooling capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfac

122225355022+2222+2522+3522+5025+2525+3525+5035+3535+5050+5022+22+2222+22+2522+22+3522+22+5022+25+2522+25+3522+25+5022+35+3525+25+2525+25+3525+25+5025

132225355022+2222+2522+3522+5025+2525+3525+5035+3535+5050+5022+22+2222+22+2522+22+3522+22+5022+25+2522+25+3522+25+5022+35+3525+25+2525+25+3525+25+5025

14Indoor unitscombinationUnit A Unit B Unit C Unit DCooling capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

15Indoor unitscombinationUnit A Unit B Unit C Unit DCooling capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

16Indoor unitscombinationUnit A Unit B Unit C Unit DHeating capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

17Indoor unitscombinationUnit A Unit B Unit C Unit DHeating capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

18Indoor unitscombinationUnit A Unit B Unit C Unit DCooling capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

19Indoor unitscombinationUnit A Unit B Unit C Unit DCooling capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

TECHNICAL CHANGES21MXZ-A26WV - ➔ MXZ-3A54VA -1. Indication of capacity has been changed. (BTU➔kW)2. Capacity specification has been changed. (Cooling

20Indoor unitscombinationUnit A Unit B Unit C Unit DCooling capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

21Indoor unitscombinationUnit A Unit B Unit C Unit DHeating capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

22Indoor unitscombinationUnit A Unit B Unit C Unit DHeating capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

23Indoor unitscombinationUnit A Unit B Unit C Unit DHeating capacity (kW)TotalOutdoor unitpower consumption(kW)Current(A)Powerfactor(%)NOTE: Electrica

24SPECIFICATION5Outdoor modelIndoor units number Piping total lengthConnecting pipe lengthHeight difference (Indoor ~ Outdoor)Height difference (Indoo

25Outdoor modelIndoor units number Piping total lengthConnecting pipe lengthHeight difference (Indoor ~ Outdoor)Height difference (Indoor ~ Indoor)Fun

26Outdoor modelIndoor units number Piping total lengthConnecting pipe lengthHeight difference (Indoor ~ Outdoor)Height difference (Indoor ~ Indoor)Fun

90807060504030201063 125 250 500 1000 2000 4000 8000APPROXIMATETERESHOLD OFHEARING FORCONTINUOUSNOISENC-60NC-50NC-40NC-30NC-20NC-70OCTAVE BAND SOUND P

28OUTLINES AND DIMENSIONS7Unit: mmMXZ-2A40VAMXZ-2A52VA51 51170.444400304 325344.517.54022.355028010800500150302.51323 28551251.169handleAir inAir out

More than 100 mmOpen as a ruleMore than 500 mmif the front and bothsides are openMore than 100 mmMore than 200 mm ifthere are obstacles toboth sidesOp

3MXZ-A14WV - ➔ MXZ-2A40VA -1. Indication of capacity has been changed. (BTU➔kW)2. Dimensions of unit has been changed. (W840oH640oD330➔W800oH550oD285)

30MXZ-4A80VAUnit: mm100500350500100500100100350200500service spaceMore thanMore thanMore thanMore thanMore thanMore thanMore thanMore thanMore thanMor

31WIRING DIAGRAM8MXZ-2A40VA MXZ-2A52VACN931CN792CN79112CN662CN6632154321CN6616LEV A LEV B66RT64RT65RT62RT61 RT68321CN932MFF901T801IC801C63CC63BC63A F8

32MXZ-3A54VAR64B21S4BLUBLU1 2WRT64(BLU)(RED)(WHT)3WHTREDLD9GRNTAB1TAB2CN601321CN60232 1 2 3CN6031REDBRNBLUORNYLWWHTCN7911 432 5 6CN7921 432 5 6REDBRNB

33MXZ-4A71VA :Terminal block :Connector3.Symbols below indicate.2.Use copper conductors only (for field wiring). diagram for servicing.

34MXZ-4A80VA :Terminal block :Connector3.Symbols below indicate.2.Use copper conductors only (for field wiring). diagram for servicing.

35Indoor unitExtension pipe diameterclass Pipe diameterLiquid 6.35(1/4) Liquid 6.35(1/4)22/25/35Gas 9.52(3/8) Gas 9.52(3/8)REFRIGERANT SYSTEM DIAGRAM9

36Indoor unitExtension pipe diameterclass Pipe diameterLiquid 6.35(1/4) Liquid 6.35(1/4)22/25/35Gas 9.52(3/8) Gas 9.52(3/8)Liquid 6.35(1/4) Liquid 6.3

37Unit:mm● Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to the tables below. ● Wh

38Unit:mm● Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to the tables below. ● Wh

39PERFORMANCE CURVES10The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions,s

4RefrigerationoilRefrigerantNew refrigerantR410AHFC-32: HFC-125 (50%:50%)Pseudo-azeotropic refrigerantNot includedA1/A172.6-51.41.55764Non combustible

4010-1. Capacity and the input curves MXZ-2A40VAMXZ-2A52VA22 class8.57.87.16.45.85.19.38.57.87.06.35.610.69.78.87.97.16.335 class25 class25.423.421.51

41MXZ-3A54VAMXZ-4A71VA22 class8.57.87.16.45.85.19.38.57.87.06.35.660 class10.69.78.87.97.16.313.111.910.89.78.77.713.712.411.310.19.08.050 class35 cla

4210-2. Capacity and input correction by inverter output frequency (OUTDOOR UNIT:MXZ-2A40VA/2A52VA)0 50 100 1500.51.01.5<COOL>CapacityFrequencyH

43(OUTDOOR UNIT:MXZ-3A54VA)0 50 100 1500.51.01.5<COOL>CapacityFrequencyHz0 50 100 1500.51.01.5<COOL>Total inputFrequencyHz0 50 100 1500.51

44(OUTDOOR UNIT:MXZ-4A71VA)0 50 100 1500.51.01.5<COOL>CapacityFrequencyHz0 50 100 1500.51.01.5<COOL>Total inputFrequencyHz0 50 100 1500.51

45(OUTDOOR UNIT:MXZ-4A80VA)0 50 100 1500.51.01.5<COOL>CapacityFrequencyHz0 50 100 1500.51.01.5<COOL>Total inputFrequencyHz0 50 100 1500.51

460 50 100 1500.51.01.5<COOL>CapacityFrequencyHz0 50 100 1500.51.01.5<COOL>Total inputFrequencyHz0 50 100 1500.51.01.5<HEAT>Capacity

47MXZ-3A54VA MXZ-4A71VA22-class unitAmbient temperature(:)Ambient humidity(%)Ambient temperature(:)Ambient humidity(%)Outdoor low pressure(MPa[Gauge])

48MXZ-4A80VA22-class unitAmbient temperature(:)Ambient humidity(%)Ambient temperature(:)Ambient humidity(%)Outdoor low pressure(MPa[Gauge])(kgf/F[Gaug

49MXZ-3A54VA MXZ-4A71VA5 10 15 20 25234567Ambient temperature(:)48HzOutdoor unit current (A)22-class unit 25-class unit5 10 15 20 25234567Ambient temp

5-30 -20 -10 0 10 203040 50 60-0.50.00.51.01.52.02.53.03.54.0(MPa [Gauge])R410AR22Conversion chart of refrigerant temperature and pressureSaturated li

50ACTUATOR CONTROL11Relation between main sensor and actuatorDischarge temperature thermistorIndoor pipe temperature thermistorDefrost thermistorGas p

5112-3. AUTO LINE CORRECTING function (MXZ-2A)This outdoor model has an auto line correcting function which automatically detects incorrect wiring or

52The auto line correcting can be confirmed in the following way:1 Turn OFF the power supply.2 Turn ON the 4th Dip Switch of SW1 on the display P.C. b

53TROUBLESHOOTING133. Troubleshooting procedure1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate a

54The left lamp of OPERATION INDICAORlamp(Indoor unit)OFF2-time flash3-time flash4-time flash5-time flash6-time flash7-time flash8-time flashLighting

5511-time flash15-time flash• Replace the power board.• Replace the power board.• Refer to 13-6.D "Check of LEV". • Check the drain p

56The left lamp of OPERATION INDICAORlamp(Indoor unit)OFF2-time flash3-time flash4-time flash5-time flash6-time flash7-time flash8-time flashLighting

57Operation startCheck the outdoor unit LED indicator.Refer to 13-6.A "Check of power supply".• Indoor unit serial signal errorRefer to 13-6

5813-4. Troubleshooting check table MXZ-2ALED1(Red) LED2(Yellow)Lightning Twice Outdoor power system• Check the connection of the compressor connectin

59--9 timesLightingInverter check modeLightingLightingNormalWhen the unit is operated with emergency operation switch.-5 timesLightingCooling high-pre

6Electronic scale for refrigerant chargingOutdoor unitRefrigerant gas cylinderoperating valveRefrigerant gas cylinderfor R410A with siphonRefrigerant

60MXZ-3A/4ALED1(Red) LED2(Yellow)Lightning Twice Outdoor power system• Check the connection of the compressor connecting wire.• Refer to 13-6.E "

61Primary current protectionSecondary current protectionHigh-pressure protectionDefrosting in cooling3 timesLightingDischarge temperatureprotection• C

62NormalMXZ-2A40/520.56Ω ~ 0.69ΩDischarge temperaturethermistor (RT62)Fin temperature thermistor (RT64)WHT - REDRED - ORNMeasure the resistance using

63AACheck of power supplyOutdoor unit does not operate. (LED display: display OFF)Turn on power supply.NoYesYesNoNoYesNoYesYesNoReplace the power boar

64Is there rated voltage in the power supply?Is there any mis-wiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?W1. Mi

65CCCheck of R.V. coilNoYesNoYesNoYesNoYesNoYes1. Disconnect the lead wire leading to the compressor.2. 3 minutes after turning on the power supply, s

66DDCheck of LEVNoYesNoYesTurn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.Is "click - click&

67EEHow to check inverter/ compressor• When heating, room does not get warm.• When cooling, room does not get cool.LED display:LED1 LED2Lighting Light

68FFCheck of outdoor thermistors• When thermistor is abnormal. (When the LED display is a table below.)NormalYesNoAbnormalReconnect the connector in t

69GGCheck of outdoor fan motor• Fan motor does not operate or stops operating shortly after starting the operation.YesYesYesNo(Fixed to either 5V or 0

7PART NAMES AND FUNCTIONS2ACCESSORIESMXZ-2A40VAMXZ-2A52VADrain socketDrain capQuick Clean kit 1−−12112−123MXZ-2A40VAMXZ-2A52VAMXZ-3A54VA - E1MXZ-4A71V

70HHCheck of HPSInfinity0"YesNoYes1. Disconnect the connector CN681 in the electronic control P.C. board.2. Check the resistance of HPS after 1 m

71Back side of unit-20 -10 0 10 20 30 400102030405060708090100Temperature(:)Defrost thermistor(RT61)Ambient temperature thermistor(RT65)Outdoor heat e

720 10 20 30 40 50 60 70 80 90 100 110 1207006005004003002001000Resistance (k')Temperature (;)Discharge temperature thermistor (RT62)-20 -10 0 10

73{CN912R.V. coil 230V AC230V AC50HzInput230V AC50Hz Output{{CN901To electroniccontrol P.C. boardMXZ-3A54VAMXZ-4A71VAMXZ-4A80VAF64 FUSE2A/250VF911 FUS

74R.V.coil(CN912)230V ACBack side of unitMXZ-2A40VA MXZ-2A52VAFront side of unitTo inverter P.C.board(CN934)F61(FUSE)20A/250V4. Power P.C. boardFUSE(F

75MXZ-3A54VAMXZ-4A71VAMXZ-4A80VA13325-370V DCOutput(Red)(White)Connect to the compressorVoltage among phases: 5V to 180VConnect tothe earthCN5Primary

76MXZ-2A40VA MXZ-2A52VA6. Display P.C. boardMXZ-2A40VA MXZ-2A52VA7. Interface P.C. boardSW1GND5VLED2LED1GND5VSerial signal room ASerial signal room B2

77DISASSEMBLY INSTRUCTIONS14OPERATING PROCEDUREPHOTOSPhoto 11. Removing the cabinet.(1) Remove the screw fixing the service panel. (See Photo 1.)(2) P

784. Removing the discharge temperature thermistor,defrost thermistor and outdoor heat exchangertemperature thermistor(1) Remove the top panel, cabine

79OPERATING PROCEDUREPHOTOSPhoto 5Defrostthermistor5. Removing outdoor fan motor(1) Remove the top panel, cabinet and service panel.(Refer to 1.)(2) D

8INDOOR/ OUTDOOR CORRESPONDENCE TABLE3MXZ-2A40VAMXZ-2A52VAMXZ-3A54VA❈There is no combination other than this table.MXZ-4A71VA22+2222+2522+3525+2525+35

80OPERATING PROCEDUREPHOTOS1. Removing the compressor(1)Remove the screws of the top panel, and remove the toppanel.(2)Remove the screws of the servic

81OPERATING PROCEDUREPHOTOS2. Removing the fan motor(1)Remove the top panel, the service panel, and the cabinet.(Photo 1)(2)Disconnect the connector C

82OPERATING PROCEDURE PHOTOS5. Removing the reactor(1)Remove the top panel. (Photo 1)(2)Remove the service panel, cabinet, back panel and the relaypan

83OPERATING PROCEDUREPHOTOS1. Removing the compressor(1)Remove the screws of the top panel, and remove the toppanel.(2)Remove the screws of the servic

84OPERATING PROCEDUREPHOTOS3. Removing the 4-way valve(1)Remove the top panel. (Photo 1)(2)Remove the service panel, rear panel, and pipe cover. Recov

85OPERATING PROCEDURE PHOTOS5. Removing the reactor(1)Remove the top panel. (Photo 1)(2)Disconnect the reactor lead wire.(3)Remove the screws of the r

86PARTS LIST1515-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS111122151713109MXZ-2A40VA MXZ-2A52VA34567816141819OB377--3.qxp 05.12.14 3:35 PM

87E02 927 232E02 927 521E02 927 501E02 A45 290E02 A47 900E02 065 506E02 927 661E02 927 662E02 A47 245E02 A47 233E02 735 640E02 A48 493E02 A47 961E02 9

8815-2. OUTDOOR UNIT ELECTRICAL PARTS14121 5REACTORPOWER P.C. BOARDINTERFACE P.C. BOARDR.V. COILTHERMISTOR SETAMBIENT TEMPERATURE THERMISTORFIN TEMPER

89Outdoor unit {42 drain holeSoft vinyl chloride hose of25mm inside diameter.MXZ-2A40VA MXZ-2A52VA15-3. DRAIN SOCKETSymbolin WiringDiagramQ'ty/un

9❈There is no combination other than this table.MXZ-4A80VA MXZ-4A80VACombination of the connectable indoor units22+2222+2522+3522+5022+6022+7125+2525+

90MXZ-3A54VAMXZ-4A71VA15-4. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS3214 132122232411125 6 7 8 9 10 14151617181920OB377--3.qxp 05.12.14 3:3

91Symbolin WiringDiagramQ'ty/unitMXZ-3A54VA-RemarksParts No. Parts NameE1MXZ-4A71VA-E1E2 E2E02 939 232E02 817 009E02 939 521E02 939 900E0

9210981243 57126MXZ-3A54VAMXZ-4A71VA15-5. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS111615-6. ACCESSORY17OB377--4.qxp 05.12.14 3:18 PM Page

93Part numbers that are circled are not shown in the illustration.Symbolin WiringDiagramQ'ty/unitMXZ-3A54VA-RemarksParts No. Parts NameE1MXZ-4A71

94MXZ-4A80VA15-7. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS321413162223242556121178910171514181920212OB377--4.qxp 05.12.14 3:18 PM Page 94

95Symbolin WiringDiagramQ'ty/unitRemarksParts No. Parts NameMXZ-4A80VA-E1M21 TK0 232M21 TK0 027M21 TK5 010M21 TK0 245T92 500 801T2W TK

961615-9. ACCESSORY1110912435 687MXZ-4A80VA15-8. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS12OB377--4.qxp 05.12.14 3:18 PM Page 96

97Part numbers that are circled are not shown in the illustration.Symbolin WiringDiagramQ'ty/unitRemarksParts No. Parts NameMXZ-4A80VA-E1M21 TK0

OPTIONAL PARTS16CCCopyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTDDistributed in Dec. 2005. No.OB377 REVISED EDITION-A 8Distributed in Feb. 2005